Journal
NANO ENERGY
Volume 85, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2021.106019
Keywords
Flexible solar cells; Thin films; Sb2Se3; Epitaxial CdS; Interfacial diffusion
Categories
Funding
- Empire State Development's Division of Science, Technology, and Innovation (NYSTAR, United States) through Focus Center-New York [C150117]
- Rensselaer, United States
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The authors successfully fabricated flexible Sb2Se3 thin film solar cells with epitaxial CdS buffer layer, achieving a high power conversion efficiency and excellent stability. These results demonstrate the potential application of Sb2Se3 solar cells in flexible, lightweight, and wearable power supply.
Recently, Sb2Se3, an Earth-abundant constituents compound, has emerged as a promising low-cost thin film photovoltaic material. The Sb2Se3 solar cells with a polycrystalline CdS buffer layer suffer from unsatisfactory photoexcitation stability. Herein, we fabricate flexible Sb2Se3 thin film solar cells by utilizing the transferable van der Waals epitaxial CdS on mica as a buffer layer. Compared to the nonepitaxial CdS buffer layer, the epitaxial CdS can significantly reduce the interface defects and interfacial diffusion. With the improved Sb2Se3/CdS interface, we obtained a power conversion efficiency of 7.15%, and the flexible Sb2Se3 solar cell exhibits an excellent stability under the continuous illumination. In addition, after 1000 bending cycles with a 50 degrees bending angle, the flexible device maintained over 90% of the initial efficiency. These encouraging results demonstrate a potential application of Sb2Se3 solar cells in flexible, lightweight, and wearable power supply.
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